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| 1 | Spray drift characteristics test of unmanned aerial vehicle spray unit under wind tunnel conditions显示文摘Since the 2010s,unmanned aerial vehicle(UAV)sprayer was applied more and more widely for low-volume aerial pesticides spraying operations in China.However,droplets from the UAV sprayer have a higher drift risk due to more fine droplets sprayed and a higher flight height than ground sprayers.Study on UAV spray drift has been a new hot spot within the field of pesticide application technology.Most of previous studies used direct field methods for spray drift,but the meteorological conditions in field were unstable and uncontrollable,and drift research under an actual operation state in wind tunnel has not been reported.Therefore,25 treatments of wind tunnel measurements and droplets spectrum tests of 10 models of nozzles were conducted to explore the influence factor on spray drift characteristics of UAV chemicals application in this study.A spray unit with a rotor of UAV was innovatively installed in wind tunnel,and the airstream from the wind tunnel was regarded as the relative moving natural wind to simulate the flight status.The airborne and the sediment spray drift was measured to study the effects of the nozzle type and size(flat fan,hollow cone and air-inclusion nozzles),flight speed,adjuvant(DRS-60,Y-20079,MF and G-611)and meteorological parameters(20°C&40%,20°C&80%,30°C&40%and 30°C&60%).The drift potential(DP)and the drift potential reduction percentage(DPRP)in vertical and horizontal directions were obtained for each test.Both nozzle type and size had an impact on the spray drift potential obviously by affecting the droplet size and the ratio of fine droplets,and the regression linear models between DPRPV/DPRPH and DV50,V75 were established(R2=0.934/0.925).Flight speed also had a significant effect on the spray drift characteristics,and reducing the flight speed could increase the DP effectively.Adding spray adjuvants could affect the DP under experimental meteorological parameters,and the anti-drift performance ranked in the order of DRS-60>MF>Y-20079>G-611.Recommendations were proposed in order to reduce the spray drift for UAV sprayer’s operation.These findings can contribute to provide guidelines and technical support for the wind tunnel spray drift tests of UAV and the field operation regulation of unmanned aerial PPP application. | Changling Wang Aijun Zeng Xiongkui He Jianli Song Andreas Herbst Wanlin Gao | 2020 | International Journal of Agricultural and Biological Engineering2020，13，3： | 3 |
| 2 | Three-layer phosphorene-metal interfaces显示文摘Phosphorene 最近由于它的高级搬运人活动性和悦耳的直接 bandgap 在电子的 nanoscale 和 optoelectronic 设备作为其他的隧道材料吸引了许多注意。与单层(ML ) 相比 phosphorene,很少层(FL ) phosphorene 更容易准备,在实验是更稳定的,并且被期望在 phosphorene 金属接口形成更小的 Schottky 障碍高度(SBH ) 。用 ab initio ,电子结构计算和量搬运模拟,我们执行界面的性质的系统的研究三层( 3L ) phosphorene 领域效果晶体管(联邦货物税)与几普通金属联系了(艾尔, Ag , Au , Cu , Ti , Cr , Ni ,并且 Pd )第一次。从投射乐队在垂直方向获得的 SBH 3L phosphorene 金属系统组织到左 bilayer (2L ) phosphorenes 是可比较的,那些为 2L phosphorene 联邦货物税从量运输模拟在侧面的方向获得了。当分别地, Ag 和 Cu 被用作电极,p类型 Schottky 与 0.05 的洞 SBH 联系时,为 3L phosphorene 联邦货物税的量运输模拟证明 3L phosphorene 在侧面的方向与 0.16 和 0.28 eV 的电子 SBH 形成n类型 Schottky 接触, 0.11 , 0.20 ,在侧面的方向的 0.30 , 0.30 ,和 0.31 eV 当 Cr , Pd , Ni , Ti ,艾尔,和 Au 分别地被用作电极时。3L phosphorene 联邦货物税的计算极性和 SBH 通常与可得到的实验一致。 | Xiuying Zhang Yuanyuan Pan Meng Ye Ruge Quhe Yangyang Wang Ying Guo Han Zhang Yang Dan Zhigang Song Jingzhen Li Jinbo Yang Wanlin Guo Jing Lu | 2018 | Nano Research2018，11，2： | 2 |
| 3 | Fuzzy intelligent control method for improving flight attitude stability of plant protection quadrotor UAV显示文摘At present,the attitude control method of plant protection UAV is the classical PID control,but there are some imperfections in the PID control,such as the contradiction between speediness and overshoot,the weak anti-jamming ability and adaptability.The physical parameters of plant protection UAV are time-varying,and the airflow also interferes with it.The control ability of classical PID is limited,and its control parameters are fixed,and its anti-jamming ability and adaptability are not strong.Therefore,a fuzzy adaptive PID controller is proposed in this paper.Fuzzy logic control is used to optimize the control parameters of PID in order to improve the dynamic and static performance and adaptability of attitude control of plant protection UAV.In the process of research,the mathematical model of UAV is established firstly,then the fuzzy adaptive PID is designed,and then the simulation is carried out in Simulink.The simulation results show that the fuzzy adaptive PID controller has better dynamic and static control performance and adaptability than the traditional PID controller.Therefore,the proposed control method has excellent application value in the attitude of plant protection UAV. | Zhihui He Wanlin Gao Xiongkui He Minjuan Wang Yunling Liu Yue Song Zewu An | 2019 | International Journal of Agricultural and Biological Engineering2019，12，6： | 1 |
| 4 | Abnormalcortical thickness in relapsing-remitting multiple sclerosis,correlations with cognition impairment,and effect of modified Bushenyisui decoction(补肾益髓汤)on cognitive function of multiple sclerosis显示文摘OBJECTIVE:To investigate the changes of subcortical gray matter volume and cortical thickness,andexplorethe correlations between regional abnormalities of cortical thickness and cognitive impairment and the effect of modified Bushenyisui decoction(补肾益髓汤,BSYSD)on the cognitive function of multiple sclerosis(MS).METHODS:This prospective study was approved by the institutional review board.92 subjects were recruited,including 46 relapsing-remitting multiple sclerosis(RRMS)patients and 46 healthy controls(HC).Of the 46 patients,22 patients experienced the treatment of BSYSD for half a year.A conventional three-dimensional T1-weighted sequence were acquired for all participants on a 3.0 tesla magnetic resonance system.Basic information,detailed cognitive scales Montreal Cognitive Assessment(MoCA),symbol digit modalities test(SDMT),immediate memory,delayed recall,and long-term recognition were evaluated.Subcortical gray matter volume and cortical thickness weremeasured by FreeSurfer.The correlations between cortical thickness which MS patients showed reduced with respect to HC and cognitive scales wereanalyzed by Pearson correlation in RRMS patients.The influence of modified BSYSD on MS patients'cognition was analyzed by paired T Test.RESULTS:MoCA,immediate memory,delayed recall,and long-term delayed recognition in RRMS were significantly decreased than those of HC.Gray matter atrophy measured by FreeSurfer showed mainly in thalamus and hippocampus of RRMS patients.Compared with HC,the cortical thickness of several regions in frontal lobe,parietal lobe,temporal lobe,hippocampal,cingulate gyrus,and fusiform gyrus of RRMS patients were decreased with significant difference.The regions of cortical thickness thinning related to MoCA,immediate memory,delayed recall,and long-term delayed recognition were temporal lobe and fusiform gyrus.Modified BSYSD could improve MoCA,SDMT,immediate memory,delayed recall,and long-term delayed recognition of MS patients,and it could promote the recovery of cognitive function in MS patients.CONCLUSIONS:Gray matter atrophy and cortical thickness thinning were validated in RRMS.Cortical thickness thinning of temporal lobe and fusiform gyrus strongly related to cognitive deficits in RRMS.The modified BSYSD could promote the recovery of cognitive function in MS. | ZHAO Xuesong YANG Tao CHENG Fang YANG Song ZHU Wanlin LI Shaowu FAN Yongping | 2021 | Journal of Traditional Chinese Medicine2021，41，2： | 1 |
| 5 | Eff ects of temperature on photosynthetic performance and nitrate reductase activity in vivo assay in Gracilariopsis lemaneiformis (Rhodophyta)显示文摘Gracilariopsis lemaneiformis is an economically-valued species and widely cultured in China at present.After being acclimated to diff erent growth temperatures(15,20,25,and 30°C)for 7 days,the relative growth rate(RGR),nitrate reductase activity,soluble protein content and chlorophyll a fl uorescence of G.lemaneiformis were examined.Results show that RGR was markedly aff ected by temperature especially at 20°C at which G.lemaneiformis exhibited the highest eff ective quantum yield of PSII[Y(II)]and lightsaturated electron transport rate(ETR max),but the lowest non-photochemical quenching.Irrespective of growth temperature,the nitrate reductase activity increased with the incubation temperature from 15 to 30°C.In addition,the greatest nitrate reductase activity was found in the thalli grown at 20°C.The value of temperature coeffi cient Q10 of alga cultured in 15°C was the greatest among those of other temperatures tested.Results indicate that the optimum temperature for nitrate reductase synthesis was relatively lower than that for nitrate reductase activity,and the relationship among growth,photosynthesis,and nitrate reductase activity showed that the optimum temperature for activity of nitrate reductase in vivo assay should be the same to the optimal growth temperature. | Zhihai ZHONG Zhengyi LIU Longchuan ZHUANG Wanlin SONG Weizhou CHEN | 2021 | Journal of Oceanology and Limnology2021，39，1： | 1 |
| 6 | Comparison of the photo-acclimation potential of fl oating and benthic thalli of Sargassum horneri(Phaeophyta)during autumn and winter显示文摘Sargassum horneri is a foundational species and an important contributor to the fl oating seaweed stock along the northeastern coast of Asia.In this study,benthic and fl oating thalli of S.horneri were collected from Changdao Island(37°54′N,120°43′E),Bohai Bay,China.We conducted an in-situ and an indoor experiment to study the acclimation potential in S.horneri to abiotic conditions at sea surface in autumn and winter.Both benthic and fl oating thalli were cultured in situ for two months(from October to December)at diff erent depths:0 m above sea level(masl)and 3 m below sea level(mbsl),and their growth rate,biochemical content,and photosynthetic performance were compared.During the fi rst month of culture,the relative growth rate of fl oating thalli was 2-fold greater than that of benthic thalli at 0 masl.The photosynthetic rate of most thalli was signifi cantly higher at 0 masl than at 3 mbsl.In the indoor experiments,fl oating and benthic thalli were exposed to high light intensity(400μmol photons/(m^(2)·s)photosynthetically active radiation(PAR))for 21 d,and their photo-acclimation capacities were compared.Under high light intensity,the two types of thalli showed low maximum quantum yield(F_(v)/F_(m))and light utilisation effi ciency(α)but high light saturation point(E_(k)).Floating thalli showed higher photosynthetic rate and photoprotective ability than benthic thalli at high light intensity.The eff ective quantum yield of photosystem II[Y(II)]of both types of thalli recovered after a 6-day treatment with low light intensity(40μmol photons/(m^(2)·s)).These fi ndings suggest that S.horneri is highly acclimated to the sea surface environment,which possibly contributes to its rapid accumulation and long free-fl oating periods at the sea surface. | Jingjing LI Yunlong PANG Song QIN Zhengyi LIU Zhihai ZHONG Wanlin SONG Longchuan ZHUANG | 2022 | Journal of Oceanology and Limnology2022，40，1： | 0 |
| 7 | Recommendations for control and prevention of infections for pediatric orthopedics during the epidemic period of COVID-19显示文摘The outbreak of Coronavirus Disease 2019(COVID-19)caused by severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)emerged and spread rapidly throughout the world.As of February 29,2020,79389 cases of COVID-19 have been reported,and the outbreak is linked to 2838 deaths.The population is generally susceptible to the disease,and differences in incubation periods after infection exist among individuals.These two aspects of COVID-19 pose significant challenges to pediatric orthopedic diagnosis and treatment.As a dedicated center for managing pediatric cases of SARS-CoV-2 in Shanghai,our hospital has mobilized all branches and departments to undertake joint actions for scientific prevention and control,precise countermeasure and comprehensive anti-epidemic efforts.Combined with our experience,we have consulted the relevant national regulations and the latest research advances and have formulated the prevention and control measures of SARS-CoV-2 infection,including outpatient,emergency,inpatient and surgical cares,for clinical practices of pediatric orthopedics according to the physicochemical properties of SARS-CoV-2.It may serve as practical references and recommendations for managing SARS-CoV-2 infection in other pediatric specialties and in other hospitals. | Chunxing Wu Zhiqiang Zhang Yueqiang Mo Dahui Wang Bo Ning Ping Xu Jun Song Xinhong Pei Xiaoyan Ni Yiming Zheng Tian Xia Yanhui Jing Wanlin Sun Junrong Meng Chuang Qian | 2020 | World Journal of Pediatric Surgery2020，3，1： | 0 |
| 8 | Stable partial nitritation of mature landfill leachate in a continuous flow bioreactor:Long-term performance,microbial community evolution,and mechanisms显示文摘A continuous flow bioreactor was operated for 300 days to investigate partial nitritation(PN)of mature landfill leachate,establishing the long-term performance of the system in terms of the microbial community composition,evolution,and interactions.The stable operation phase(31-300 d)began after a 30 days of start-up period,reaching an average nitrite accumulation ratio(NAR)of 94.43%and a ratio of nitrite nitrogen to ammonia nitrogen(NO_(2)^(−)-N/NH_(4)^(+)-N)of 1.16.Some fulvic-like and humic-like compounds and proteins were effectively degraded in anaerobic and anoxic tanks,which was consistent with the corresponding abundance of methanogens and syntrophic bacteria in the anaerobic tank,and organic matter degrading bacteria in the anoxic tank.The ammonia-oxidizing bacteria(AOB)Nitrosomonas was found to be the key functional bacteria,exhibiting an increase in abundance from 0.27%to 6.38%,due to its collaborative interactions with organic matter degrading bacteria.In-situ inhibition of nitrite-oxidizing bacteria(NOB)was achieved using a combination of free ammonia(FA)and free nitrous acid(FNA),low dissolved oxygen(DO)with fewer bioavailable organics conditions were employed to maintain stable PN and a specific ratio of NO_(2)^(−)-N/NH_(4)^(+)-N,without an adverse impact on AOB.The synergistic relationships between AOB and both denitrifying bacteria and organic matter degrading bacteria,were found to contribute to the enhanced PN performance and microbial community structure stability.These findings provide a theoretical guidance for the effective application of PN-Anammox for mature landfill leachate treatment. | Xiaoling Hu Jianyang Song Yantong Ji Chaojing Li Jia Wei Wanlin Lyu Bin Wang Wenbin Guo Rongfan Chen Hongyu Wang Dao Zhou Qian Zhang | 2023 | Chinese Chemical Letters2023，34，11： | 0 |
| 9 | Discovery and inspiration of large-and medium-sized glutenite-rich oil and gas fields in the eastern South China Sea:An example from Paleogene Enping Formation in Huizhou 26 subsag,Pearl River Mouth Basin显示文摘Based on the practice of oil and gas exploration in the Huizhou Sag of the Pearl River Mouth Basin,the geochemical indexes of source rocks were measured,the reservoir development morphology was restored,the rocks and minerals were characterized microscopically,the measured trap sealing indexes were compared,the biomarker compounds of crude oil were extracted,the genesis of condensate gas was identified,and the reservoir-forming conditions were examined.On this basis,the Paleogene Enping Formation in the Huizhou 26 subsag was systematically analyzed for the potential of oil and gas resources,the development characteristics of large-scale high-quality conglomerate reservoirs,the trapping effectiveness of faults,the hydrocarbon migration and accumulation model,and the formation conditions and exploration targets of large-and medium-sized glutenite-rich oil and gas fields.The research results were obtained in four aspects.First,the Paleogene Wenchang Formation in the Huizhou 26 subsag develops extensive and thick high-quality source rocks of semi-deep to deep lacustrine subfacies,which have typical hydrocarbon expulsion characteristics of'great oil generation in the early stage and huge gas expulsion in the late stage',providing a sufficient material basis for hydrocarbon accumulation in the Enping Formation.Second,under the joint control of the steep slope zone and transition zone of the fault within the sag,the large-scale near-source glutenite reservoirs are highly heterogeneous,with the development scale dominated hierarchically by three factors(favorable facies zone,particle component,and microfracture).The(subaqueous)distributary channels near the fault system,with equal grains,a low mud content(<5%),and a high content of feldspar composition,are conducive to the development of sweet spot reservoirs.Third,the strike-slip pressurization trap covered by stable lake flooding mudstone is a necessary condition for oil and gas preservation,and the NE and nearly EW faults obliquely to the principal stress have the best control on traps.Fourth,the spatiotemporal configuration of high-quality source rocks,fault transport/sealing,and glutenite reservoirs controls the degree of hydrocarbon enrichment.From top to bottom,three hydrocarbon accumulation units,i.e.low-fill zone,transition zone,and high-fill zone,are recognized.The main area of the channel in the nearly pressurized source-connecting fault zone is favorable for large-scale hydrocarbon enrichment.The research results suggest a new direction for the exploration of large-scale glutenite-rich reservoirs in the Enping Formation of the Pearl River Mouth Basin,and present a major breakthrough in oil and gas exploration. | XU Changgui GAO Yangdong LIU Jun PENG Guangrong LIU Pei XIONG Wanlin SONG Penglin | 2024 | Petroleum Exploration and Development2024，51，1： | 0 |
| 10 | A nonparametric variable step-size subband adaptive filtering algorithm for acoustic echo cancellation显示文摘Acoustic echo cancellation is often applied in communication and video call system to reduce unnecessary echoes generated between speakers and microphones.In these systems,the speech input signal of the adaptive filter is often colored and unstable,which decays the convergence rate of the adaptive filter if the NLMS algorithm is used.In this paper,an improved nonparametric variable step-size subband(NPVSS-NSAF)algorithm is proposed to address the problem.The variable step-size is derived by minimizing the sum of the square Euclidean norm of the difference between the optimal weight vectors to be updated and the past estimated weight vectors.Then the parameters are eliminated by using the power of subband signal noise equal to the power of subband posteriori error.The performance of the proposed algorithm is simulated in the aspects of misalignment and return loss enhancement.Experiment results show a fast convergence rate and low misalignment of the proposed algorithm in system identification. | Yue Song Yanzhao Ren Xinliang Liu Wanlin Gao Sha Tao Lin Guo | 2020 | International Journal of Agricultural and Biological Engineering2020，13，3： | 0 |
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